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  1. May 25, 2016 #1
    1. The problem statement, all variables and given/known data
    A child 1.52 meters tall pulled a 2.54 kg toy car for 10 meters. The car has a string attached to it, and when pulled creates a 25 degree angle from the horizon. If the string has a force of 123 N on it while being pulled, how much work did the child do?

    2. Relevant equations
    work = force x displacement

    3. The attempt at a solution
    W = (123 N)(10 m) cos(25 degrees) = 1114.8 J

    is this correct? does the child's height have anything to do with the problem?
  2. jcsd
  3. May 25, 2016 #2

    Doc Al

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    Staff: Mentor

    Yep! Good!

    Nope. (Neither does the car's mass.)
  4. May 25, 2016 #3
    Seems okay to me and no, the child's height is irrelevant.
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